qeth: Add new priority queueing options

The existing options for priority queueing within OSA devices were based on
the now partially defunct TOS field. This patch adds two new options as
follows:
   - prio_queueing_skb: bases priority queueing on skb-priority
   - prio_queueing_vlan: uses the priority code point in the 802.1Q header
Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Reviewed-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/s390/net/qeth_core.h

@@ -268,6 +268,8 @@ static inline int qeth_is_ipa_enabled(struct qeth_ipa_info *ipa,
 #define QETH_NO_PRIO_QUEUEING 0
 #define QETH_PRIO_Q_ING_PREC  1
 #define QETH_PRIO_Q_ING_TOS   2
+#define QETH_PRIO_Q_ING_SKB   3
+#define QETH_PRIO_Q_ING_VLAN  4
 
 /* Packing */
 #define QETH_LOW_WATERMARK_PACK  2

drivers/s390/net/qeth_core_main.c

@@ -3677,12 +3677,9 @@ EXPORT_SYMBOL_GPL(qeth_qdio_output_handler);
 int qeth_get_priority_queue(struct qeth_card *card, struct sk_buff *skb,
 			int ipv, int cast_type)
 {
+	__be16 *tci;
 	u8 tos;
 
-	if (!ipv && (card->info.type == QETH_CARD_TYPE_OSD ||
-		     card->info.type == QETH_CARD_TYPE_OSX))
-		return card->qdio.default_out_queue;
-
 	if (cast_type && card->info.is_multicast_different)
 		return card->info.is_multicast_different &
 			(card->qdio.no_out_queues - 1);
@@ -3710,6 +3707,16 @@ int qeth_get_priority_queue(struct qeth_card *card, struct sk_buff *skb,
 			return 1;
 		if (tos & IPTOS_LOWDELAY)
 			return 0;
+		break;
+	case QETH_PRIO_Q_ING_SKB:
+		if (skb->priority > 5)
+			return 0;
+		return ~skb->priority >> 1 & 3;
+	case QETH_PRIO_Q_ING_VLAN:
+		tci = &((struct ethhdr *)skb->data)->h_proto;
+		if (*tci == ETH_P_8021Q)
+			return ~*(tci + 1) >> (VLAN_PRIO_SHIFT + 1) & 3;
+		break;
 	default:
 		break;
 	}

drivers/s390/net/qeth_core_sys.c

@@ -217,6 +217,10 @@ static ssize_t qeth_dev_prioqing_show(struct device *dev,
 		return sprintf(buf, "%s\n", "by precedence");
 	case QETH_PRIO_Q_ING_TOS:
 		return sprintf(buf, "%s\n", "by type of service");
+	case QETH_PRIO_Q_ING_SKB:
+		return sprintf(buf, "%s\n", "by skb-priority");
+	case QETH_PRIO_Q_ING_VLAN:
+		return sprintf(buf, "%s\n", "by VLAN headers");
 	default:
 		return sprintf(buf, "always queue %i\n",
 			       card->qdio.default_out_queue);
@@ -253,9 +257,19 @@ static ssize_t qeth_dev_prioqing_store(struct device *dev,
 	if (!strcmp(tmp, "prio_queueing_prec")) {
 		card->qdio.do_prio_queueing = QETH_PRIO_Q_ING_PREC;
 		card->qdio.default_out_queue = QETH_DEFAULT_QUEUE;
+	} else if (!strcmp(tmp, "prio_queueing_skb")) {
+		card->qdio.do_prio_queueing = QETH_PRIO_Q_ING_SKB;
+		card->qdio.default_out_queue = QETH_DEFAULT_QUEUE;
 	} else if (!strcmp(tmp, "prio_queueing_tos")) {
 		card->qdio.do_prio_queueing = QETH_PRIO_Q_ING_TOS;
 		card->qdio.default_out_queue = QETH_DEFAULT_QUEUE;
+	} else if (!strcmp(tmp, "prio_queueing_vlan")) {
+		if (!card->options.layer2) {
+			rc = -ENOTSUPP;
+			goto out;
+		}
+		card->qdio.do_prio_queueing = QETH_PRIO_Q_ING_VLAN;
+		card->qdio.default_out_queue = QETH_DEFAULT_QUEUE;
 	} else if (!strcmp(tmp, "no_prio_queueing:0")) {
 		card->qdio.do_prio_queueing = QETH_NO_PRIO_QUEUEING;
 		card->qdio.default_out_queue = 0;